IMPROVED CHARACTERIZATION AND FRACTIONATION OF VACUUM RESIDUES OF HEAVY CRUDE OILS USING SUPERCRITICAL FLUID EXTRACTION

摘要

The vacuum residues have atmospheric points higher than 525°nC and operationally are classified as the non-distillable fraction ofnpetroleum under vacuum distillation conditions 1. The nature of thenvacuum residue depend on the crude source and can achievenperformance trends above 45% by volume 2,3.